US3962954A - Supply apparatus for two receiving means having a pressure summation device - Google Patents

Supply apparatus for two receiving means having a pressure summation device Download PDF

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Publication number
US3962954A
US3962954A US05/546,830 US54683075A US3962954A US 3962954 A US3962954 A US 3962954A US 54683075 A US54683075 A US 54683075A US 3962954 A US3962954 A US 3962954A
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Prior art keywords
pipe
pressure
summation device
relief valve
pressure summation
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Expired - Lifetime
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US05/546,830
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English (en)
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Rene F. Jacob
Pierre C. Fillion
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Poclain SA
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Poclain SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/65—Methods of control of the load sensing pressure
    • F15B2211/651—Methods of control of the load sensing pressure characterised by the way the load pressure is communicated to the load sensing circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/65—Methods of control of the load sensing pressure
    • F15B2211/652—Methods of control of the load sensing pressure the load sensing pressure being different from the load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive

Definitions

  • FIG. 1 schematically a supply apparatus comprising a single pump according to the invention.
  • FIG. 2 schematically a supply apparatus comprising two separate pumps according to the invention.
  • FIG. 3 is a section of a one-piece assembly including a calibrated relief valve with a double control system and a pressure summation device.
  • FIG. 4 the operating diagram of either of the apparatuses of FIGS. 1 and 2.
  • the supply apparatus shown with reference to FIG. 1 comprises a pump 1 connected to a fluid tank 2 by its suction pipe 3 and to the inlet 5 of a flow divider 6 by its delivery pipe 4.
  • the flow divider 6 is schematically represented by the parallel grouping of two mutually balanced constrictions and is a per se known means which can for example be of the type shown in FIG. 4 of French Specification No. 71 19 345.
  • Two hydraulic motors 7 and 8 are connected to tank 2 by pipes 9 and 10 and to outlets 11 and 12 of flow divider 6 by pipes 13 and 14.
  • a pipe 20 is shunted on delivery pipe 4 which it connects to tank 2.
  • a calibrated relief valve 21 which is equipped with two control connections 25a and 23b. A detailed construction of this valve will be described hereinafter.
  • a pipe 28 connects the connection 23b to that portion of pipe 20 located between delivery pipe 4 and relief valve 21.
  • pipes 15 and 16 respectively connect pipes 13 and 14 with inlets 26 and 27 of pressure summation device 24.
  • the pressure summation device 24 comprises an enclosure 29 wherein is slidingly mounted a double piston 30 defining two chambers 31 and 32 which communicate respectively with inlets 26 and 27.
  • the cross-sections S 1 and S 2 of the piston faces delimiting chambers 31 and 32 are smaller than the cross-section S 3 of the piston face delimiting discharge chamber 33.
  • control connection 25a comprises a rod which connects piston 30 to the moving member 21a of relief valve 21.
  • the supply apparatus represented with reference to FIG. 2 comprises two pumps 34, 35 which are connected by their respective suction pipes 36, 37 to a fluid tank 38 and by their respective delivery pipes 39, 40 to two three-position valves 41, 42, whereby pipe 39 is connected to valve 41 and pipe 40 to valve 42.
  • Two reversible motors 43 and 44 are connected to the said two valves, motor 43 by pipes 45, 46 to valve 41 and motor 44 by pipes 47, 48 to valve 42. Moreover, pipe 49 connects valve 41 to tank 38 and pipe 50 connects valve 42 to tank 38.
  • the first position corresponds to connecting up pipes 39 and 45, 46 and 49, 40 and 47 and 48 and 50
  • the second position to connecting up pipes 39 and 49, and 40 and 50 and the sealing level with the valves of pipes 45, 46, 47 and 48
  • third position to the connecting up of pipes 39 and 46, 45 and 49, 40 and 48, and 47 and 50.
  • a connecting pipe 51 connects the delivery pipes 39, 40, whilst a shuttle valve 52 is positioned on connecting pipe 51.
  • FIG. 3 shows a relief valve 21 which is identical to that of FIGS. 1 and 2 combined with the corresponding pressure summation device 24.
  • Member 54a receives double piston 30a which constitutes a one-piece assembly with moving member 21a of the relief valve which is normally kept supported on its seat 58 by a spring 59a.
  • moving member 21a defines with member 54a two chambers 60 and 61, whereby each of which is connected with one of the portions of pipe 20.
  • FIG. 4 represents the pressure variation P 2 of the fluid contained in pipe 14 of the apparatus of FIG. 1 or in pipe 40 of the apparatus of FIG. 2 as a function of the pressure variation P 1 of the fluid contained in the pipe 13 of the apparatus of FIG. 1 or in the pipe 39 of the apparatus of FIG. 2.
  • device 24 is certainly a pressure summation device because it effects the 1/2-sum of pressures P 1 and P 2 .
  • device 24 of FIG. 1 constitutes a pressure summation device
  • that of FIG. 3 also constitutes such a device.
  • moving member 21a With reference to the pressure summation device of FIG. 3 applied to the supply apparatus of FIG. 1, at the time of opening valve 21a is balanced under the pressure forces acting on cross-sections S 1 , S 2 and S 5 and under the opposing action of force F of spring 59a.
  • the opening of the valve takes place for a pressure value in pipe 4 equal to the highest of the values of pressures P 1 , P 2 .
  • Two cases can occur depending on whether P 1 is larger or smaller than P 2 . In both cases, the equation for the forces acting on piston 30 and moving member 21a is:
  • the supply apparatus of FIG. 2 has two separate pumps. Assuming that motors 43 and 44 are supplied with pressurized fluid, i.e. valves 41 and 42 are either in the first or third positions, it is appropriate on the one hand to summate the pressures of the fluids contained in the motor supply pipes and on the other to control the relief valve 21 by the highest of these pressures and by the pressure resulting from the said pressure summation.
  • the pressure summation takes place in the same way as with the apparatus of FIG. 1 by connecting pipes 15 and 16 of the apparatus of FIG. 2 to pipes 39 and 40.
  • the double control of relief valve 21 is performed by selecting the higher of pressures P 1 and P 2 of pipes 39 and 40 by means of shuttle valve 52.
  • the invention can be applied to the case of two pumps of variable capacity, each supplying one of the motors in closed circuit.
  • the pressure which then has to be taken into consideration for each pump is the highest of the pressures of fluid contained in the two main pipes of the said pump. This highest pressure is once again collected by using a shuttle valve connected to the pipes of each pump. Otherwise the supply apparatus according to the invention remains unchanged.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Gearings (AREA)
US05/546,830 1974-02-04 1975-02-03 Supply apparatus for two receiving means having a pressure summation device Expired - Lifetime US3962954A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7403659A FR2260013B1 (pt) 1974-02-04 1974-02-04
FR74.03659 1974-02-04

Publications (1)

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US3962954A true US3962954A (en) 1976-06-15

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US (1) US3962954A (pt)
JP (1) JPS50108477A (pt)
BE (1) BE824965A (pt)
BR (1) BR7500616A (pt)
CA (1) CA1023243A (pt)
DE (1) DE2504270A1 (pt)
FR (1) FR2260013B1 (pt)
GB (1) GB1493704A (pt)
IN (1) IN144752B (pt)
IT (1) IT1027445B (pt)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112821A (en) * 1976-12-03 1978-09-12 Caterpillar Tractor Co. Fluid control system for multiple circuited work elements
EP0039473A1 (de) * 1980-05-05 1981-11-11 Vickers Incorporated Hydraulisches Kraftübertragungssystem
US4305571A (en) * 1977-02-01 1981-12-15 Karmoy Mekaniske Verksted A/S Means for regulating two trawl winches
US4377103A (en) * 1980-07-14 1983-03-22 The United States Of America As Represented By The Secretary Of The Navy Dual dependent stores ejector assembly for angular rate and position control
US4519413A (en) * 1983-03-24 1985-05-28 Hydromatik Gmbh Pressure averager
US4589444A (en) * 1983-05-30 1986-05-20 Bbc Brown, Boveri & Company, Limited Electro-hydraulic actuator for turbine valves
US4658705A (en) * 1983-06-30 1987-04-21 Kabushiki Kaisha Komatsu Seisakusho Control system for hydraulic fluid pressure
US4787204A (en) * 1987-09-28 1988-11-29 J. I. Case Company Common relief valve
US5251443A (en) * 1989-08-26 1993-10-12 Zahnradfabrik Friedrichshafen Ag Pressure-control device
US6438951B2 (en) * 1999-06-07 2002-08-27 George H. Morgan Hydraulic drive with regeneration circuit
US7000386B1 (en) * 2002-12-12 2006-02-21 Morgan George H Hydraulic intensification circuit with rotary flow devider and bypass valve
US20090169722A1 (en) * 1999-03-30 2009-07-02 Daniel Luch Substrate and collector grid structures for integrated series connected photovoltaic arrays and process of manufacture of such arrays
WO2011137038A1 (en) * 2010-04-30 2011-11-03 Eaton Corporation Multiple fluid pump combination circuit
US9217447B2 (en) 2011-07-01 2015-12-22 Eaton Corporation Hydraulic systems utilizing combination open- and closed-loop pump systems

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453334A1 (fr) * 1979-04-05 1980-10-31 Poclain Hydraulics Sa Circuit de transmission de puissance par fluide sous pression
GB2166098B (en) * 1984-10-31 1987-10-28 Trw Cam Gears Ltd Vehicle hydraulic servo system

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239148A (en) * 1938-06-10 1941-04-22 Hydraulie Dev Corp Inc Fluid pressure relief or unloading valve
US2467576A (en) * 1945-01-25 1949-04-19 Zimmermann Lukas Hydraulic system utilizing flow dividers
US2659206A (en) * 1951-04-18 1953-11-17 Goodman Mfg Co Mining machine hydraulic control system and master safety valve therefor
US3447556A (en) * 1967-02-13 1969-06-03 David Franklin Howeth Collector valve
DE1528476A1 (de) * 1966-03-10 1969-08-07 Linde Ag Steuereinrichtung fuer mehrere Pumpen
DE1919402A1 (de) * 1968-04-19 1969-12-18 Poclain Sa Einrichtung zur hydraulischen Kraftuebertragung,insbesondere fuer ein Fahrzeug
FR2138527A1 (pt) * 1971-05-27 1973-01-05 Poclain Sa
US3716308A (en) * 1970-01-28 1973-02-13 Bosch Gmbh Robert Hydraulic system
US3723026A (en) * 1970-04-22 1973-03-27 I Soyland Effect regulator for constant and variable volume-flow pumps
FR2218007A5 (pt) * 1973-02-12 1974-09-06 Poclain Sa

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239148A (en) * 1938-06-10 1941-04-22 Hydraulie Dev Corp Inc Fluid pressure relief or unloading valve
US2467576A (en) * 1945-01-25 1949-04-19 Zimmermann Lukas Hydraulic system utilizing flow dividers
US2659206A (en) * 1951-04-18 1953-11-17 Goodman Mfg Co Mining machine hydraulic control system and master safety valve therefor
DE1528476A1 (de) * 1966-03-10 1969-08-07 Linde Ag Steuereinrichtung fuer mehrere Pumpen
US3447556A (en) * 1967-02-13 1969-06-03 David Franklin Howeth Collector valve
DE1919402A1 (de) * 1968-04-19 1969-12-18 Poclain Sa Einrichtung zur hydraulischen Kraftuebertragung,insbesondere fuer ein Fahrzeug
US3716308A (en) * 1970-01-28 1973-02-13 Bosch Gmbh Robert Hydraulic system
US3723026A (en) * 1970-04-22 1973-03-27 I Soyland Effect regulator for constant and variable volume-flow pumps
FR2138527A1 (pt) * 1971-05-27 1973-01-05 Poclain Sa
FR2218007A5 (pt) * 1973-02-12 1974-09-06 Poclain Sa

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112821A (en) * 1976-12-03 1978-09-12 Caterpillar Tractor Co. Fluid control system for multiple circuited work elements
US4305571A (en) * 1977-02-01 1981-12-15 Karmoy Mekaniske Verksted A/S Means for regulating two trawl winches
EP0039473A1 (de) * 1980-05-05 1981-11-11 Vickers Incorporated Hydraulisches Kraftübertragungssystem
US4377103A (en) * 1980-07-14 1983-03-22 The United States Of America As Represented By The Secretary Of The Navy Dual dependent stores ejector assembly for angular rate and position control
US4519413A (en) * 1983-03-24 1985-05-28 Hydromatik Gmbh Pressure averager
US4589444A (en) * 1983-05-30 1986-05-20 Bbc Brown, Boveri & Company, Limited Electro-hydraulic actuator for turbine valves
US4658705A (en) * 1983-06-30 1987-04-21 Kabushiki Kaisha Komatsu Seisakusho Control system for hydraulic fluid pressure
US4787204A (en) * 1987-09-28 1988-11-29 J. I. Case Company Common relief valve
US5251443A (en) * 1989-08-26 1993-10-12 Zahnradfabrik Friedrichshafen Ag Pressure-control device
US20090169722A1 (en) * 1999-03-30 2009-07-02 Daniel Luch Substrate and collector grid structures for integrated series connected photovoltaic arrays and process of manufacture of such arrays
US6438951B2 (en) * 1999-06-07 2002-08-27 George H. Morgan Hydraulic drive with regeneration circuit
US7000386B1 (en) * 2002-12-12 2006-02-21 Morgan George H Hydraulic intensification circuit with rotary flow devider and bypass valve
WO2011137038A1 (en) * 2010-04-30 2011-11-03 Eaton Corporation Multiple fluid pump combination circuit
CN102959252A (zh) * 2010-04-30 2013-03-06 伊顿公司 多流体泵并合回路
CN102959252B (zh) * 2010-04-30 2015-03-25 伊顿公司 多流体泵并合回路
US9574579B2 (en) 2010-04-30 2017-02-21 Eaton Corporation Multiple fluid pump combination circuit
US9217447B2 (en) 2011-07-01 2015-12-22 Eaton Corporation Hydraulic systems utilizing combination open- and closed-loop pump systems

Also Published As

Publication number Publication date
BR7500616A (pt) 1975-11-11
JPS50108477A (pt) 1975-08-26
FR2260013B1 (pt) 1976-10-08
FR2260013A1 (pt) 1975-08-29
DE2504270A1 (de) 1975-08-07
IN144752B (pt) 1978-07-01
CA1023243A (en) 1977-12-27
GB1493704A (en) 1977-11-30
BE824965A (fr) 1975-05-15
IT1027445B (it) 1978-11-20

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